Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Power Transistor Driving System

IP.com Disclosure Number: IPCOM000091596D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Briot, JC: AUTHOR

Abstract

The driving system uses a transformer employing a rectangular cycle core. This system supplies a substantial base current to a power transistor to drive it in a floating condition and supplies a reverse base current which obtains a satisfactory blocking control of such transistor.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 2

Power Transistor Driving System

The driving system uses a transformer employing a rectangular cycle core. This system supplies a substantial base current to a power transistor to drive it in a floating condition and supplies a reverse base current which obtains a satisfactory blocking control of such transistor.

This system includes power transistor T1, rectangular cycle core 2, transistor T3, transistor T4, and rectangular cycle core 5. Core 2 includes control winding 6 which is fed when T3 is made conducting through the intermediary of the control current applied to its base, polarization winding 7 for resetting the core and which determines the inverse base current value of T1, clamp winding 8 which limits the resetting voltages, driving winding 9 of self-feeding winding 10. Core 5 includes windings 11 and 12.

The current for driving T1 is a function of the control current. When T3 is made conducting, this control current flows between voltage point +V and the ground. It can happen that feeding voltage +V is not stabilized, which brings about variations in the control current. In order to avoid such variations, core 5 acts as a current regulator. The current to be controlled flows through winding 11. A constant DC current is applied across winding 12. When there is no current in winding 11, the constant DC current effectively sets the core into one of the saturation areas. During the current peaks, the current in winding 11 tends to move the core from its satu...